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      01-11-2022, 09:07 PM   #33
6speed_M2
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Drives: ///M2
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@M3AWD from my experience and knowledge with tuning cars, I've heard cats begin making a larger difference above 600whp. Still, I don't see it doing more then 15-25whp tops. Ethanol or race fuel is a different story.

Since the S58 is bi turbo'd it already has relatively small cats. I think they're each about 300 cell of restriction, compared to my N55 M2 for example, which has a single turbo and a single piped exhaust from the cat to the muffler. It has one 600cell primary cat.

I'm not sure how much of a difference high flow cats would make on this car…

Overall, this car is a BEAST. I cannot wait until I get to order one for myself. The day it's here I'm taking it straight to my shop with all the stickers/covers on it and getting the entire car clear bra'd.

I've never had a black car before but I was thinking about a black exterior/interior combo w/the upgraded seats, carbon roof & xDrive.
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N54 135i 6MT (FBO, JB4 reflash, E30) sold
E90 M3 DCT (FBO, tuned) sold
Current: Performance Edition M2 6MT (FBO, ethanol tuned by Bend Calibration/Ecutek)
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M3AWD3178.00